2. Early in
gestation, a fetus develops smooth, raised pads on the fingers, palms, and feet.
怀孕早期,胎儿的手指,手掌及脚掌生长出平滑的凸起的肉垫。
3. Keepers said Asian elephants have the longest
gestation period - at 22 months - of any animal in the world.
动物看护人员说,比起世界上其他动物来,亚洲象有最长的怀孕期——22个月。